Quantifying anthropogenic modification of the shallow geosphere in central London, UK

Terrington, R.L.; Silva, E.C.N.; Waters, C.N.; Smith, H.; Thorpe, S.. 2018 Quantifying anthropogenic modification of the shallow geosphere in central London, UK. Geomorphology, 319. 15-34. 10.1016/j.geomorph.2018.07.005

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Abstract/Summary

The veneer of artificial (anthropogenic) deposits present beneath contemporary cities is commonly markedly heterogeneous, particularly in cities such as London with a history of two millennia of development. To what extent can the analysis of borehole data, historical land use maps and digital terrain models provide adequate assessment of such heterogeneity? Two adjacent London boroughs, City of London and Tower Hamlets, are selected because of their contrasting historical development and current land use. Statistical comparison of the variations in deposit thickness is related to the natural Holocene topography, underlying geological deposits (non-anthropogenic deposits) and heights of overlying buildings. Estimates of the volume (~67 million m3) and mass (~100 million tonnes) of the deposits and additional volume (~359 million m3) and mass (~25 million tonnes) of buildings provides indication of additional loading that may cause local compaction or regional subsidence, a concern during a time of rising global sea level. Extrapolated across Greater London, the mass of anthropogenic deposits is estimated at ~6 billion tonnes. Assessment of the compositional variations within the artificial deposits provides an approximation of accumulation rates post-World War II. A potential event horizon, coincident with the early 1940s Blitz, could not be demonstrated as an extensive marker, but distinct lithological compositions for post-World War II strata are broadly coincident with the globally resolved signals marking the start of the Anthropocene Epoch.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.geomorph.2018.07.005
ISSN:	0169555X
Additional Keywords:	Anthropocene, Artificial Ground, City of London, Tower Hamlets
NORA Subject Terms:	Earth Sciences
Date made live:	27 Nov 2018 13:34 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/521685

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/j.geomorph.2018.07.005

ISSN:

0169555X

Additional Keywords:

Anthropocene, Artificial Ground, City of London, Tower Hamlets

NORA Subject Terms:

Earth Sciences

Date made live:

27 Nov 2018 13:34 +0 (UTC)